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There are two 'conflicting' reports on this, for now, anyone who's already in 10+10 program will be grandfathered for 'indeterminate' time. But someone also heard from Chase phone rep that they will eventually move everyone to a different program, probably still Ultimate Rewards point program though.
In another thread on this subject, I read that existing 10+10 members will be grandfathered until the end of 2013...not certain how accurate or definitive the information is though...